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Koto, also known as Obaba (オババ), is one of the original castaways that came on the ship that sank and for what the island Airantou was named for. In advanced chapters of the manga, it is revealed that she is in fact a very powerful nine-tailed like-fox yokai capable of toying with Karaage, Shima-Tora and Taiga in combat at the same time.

When she was 18, she left for Europe to learn about the then newest technologies in food, clothing, living and medicine. On the way back to Japan their ship the "Island" was shipwrecked. She and the other survivors found a deserted island and settled on it, naming it Airantou after the ship they came on. While on the island she gets acquainted with the young Shima-Tora and Taiga.